Relief device and attachment for compressors.



- No. 823,845. PATENTED JUNE 19, 1906 R. GONRADBR. RELIEF DEVICE ANDATTACHMENT FOR.OOMPRESSORS.-

I APPLICATION FILED JAN. 29, 1902.

' 5 SHEETS-SHEET1.

fzzrzzzur I No. 823,845. I'PATENTED JUNE 19,1906 I =11. GONRADBR. I

RELIEF DEVICE AND ATTACHMENT FOR OOMPRESSORS.

APPLICATION FILED JAN.29. 1902.

5 SHEETSSEBET 2.

. QWMM v No. 823,845. PATENT-ED JUNE 19, 1906.

- v R. GONRADE-R. RELIEF DEVICE AND ATTACHMENT PORROOMPRESSOIRS.

APPLIOATION FILED JAN. 29, 1902.

I 5 SHEETS-SHEET 3.

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R. GONRADBR. RELIEF DEVICE AND ATTACHMENT FOR. COMPRESSOR8.

APPLICATION FILED JAN. 29, 1902.

PATBNTED JUNE 19, 1906.

5 SIIBETS--SHEET 4.

PATENTED JUNE 19, 1906.

" v R .CONRADER.

RELIEF DEVICE-AND ATTACHMENT FOR QOMPRESSORS.

APPLICATION FILED JAN. 29, 1 902.

5 SIIEETSSHBET 5.

* rear/3r NAT ' and pointed out in the claims. I

UNITED sTArEs PATENT oFFIoE.

RUDOLPH CONRADER, 0F ERIE, PENNSYLVANIA. REL lEF DiEtllcE ANDATTACHM-ENT Fo comPRsssors,

To all whom it mag concern Be it known that L'RUDOLPHOONRADER, a

citizen of the United States, residing atv Erie,

in the county of Erie and Stateof Pennsyl-- vania, have invented certainnew and useful Improvements in Relief Devices and Attachments forCompressors; and I do hereby de clare the following to be a full, clear,and ex-- act descri tion ofthe invention, such as will enable ot ersskilled in the art to Which it appertains to make and use the same.

thereof, as will be hereinafter fully described well understood. A

he ordinary purposes of'relief devices are The object of this invention,is tov rovide asimple and effective device of this c aracter.

-Where relief devices are so designed as to producea reduction ofpressure at the compressor during the time that the relief device 1's 1noperation, it becomes necessary to provide some valve mechanism toprevent a ordinarily accomplished by the use of a check-valve. -Wherethe ordinary. checkvalve is used, it operates with each-pulsation of thecompressor, causing an unnecessary as we as considerable 110186. I haveprovided an attachment for the relief device which prevents this action,

5o. 't v lv s; similar in construction to' those now in com- J Thevalves D Dare of cylindrical sh ape and fit in the valve-chambers a,form;-

and this attachment is one ef the features of my invention. i r

The invention is illustratedin-the accom-' panying drawings as folloWs:

Figure 1 shows a central section of the compressor and relief device online 1 1 in Fig. 2.- Fig. 2 is a plan view of the compressor and reliefdevice. Fig. 3 is an end elevation of the same viewed from the right'of'Fig. 2. Fig. 4 is a section ofa detail of thecheck-valve-op eratingmechanism on the line 4 4 in Fig. 5'."

Fig. 5 is a side elevation of the same detail. Fig. 6;is a centralsection of an alternative construction on-the line 6 6 in Fig. 7 Fig.

7 is'agplan view of the same construction.

A marks the compressor-cylinder, and B the piston or pllunger therein;C, the intaket e outlet-valves. These," are men use.

ing plungers' in said chambers. The Springs (2 are tensioned against thevalves andtend to 7 Specification of Letters Patent. Application 51611Tannery 29, 1902. Serial No. 91,783.

Patented June 19, 1906.

keepthem closed. A passage A. connects the outlet-ports a a. Theoutlet-passage E connects with-the passa e A. Arranged in this passageis a check-Va ve F. The passage E connects with the pipe E, which may becalled for the purpose of explaining the intiom nected by the piped'with a chamber G. The chamber G is connected with the passage E by thepassage 9/ The assa e g is controlled by thevalve G T eva ve G is nor-.the chamber (1 therefore immediately falls below that in the passage A,so that the valves D are forced open by pressure in the thepassage A. Asthe compressor continues to operate the'fiuid is simply moved from endand ports a.

The relief mechanism is as follows: A

atmosphere. The. valve H is arranged to valve is conneoted with theplunger H, which operates in a cylinder 1. The stem of the h exten supwardly from the plunger H. Arranged on the top of this stem is a yokeh. This is secured in place by the nut h Extending from each side of thecylinder I are the lugs t. The springs H are tensioned' between theyokeh and the'lngs i. 'The pressure of these springs is exerted to forcethe valve H to its closed position. Connecting with the cylinder I j achamber I, from which is'a' contracted haust-o ening i and into whichleads a assage 'i'. n he passa e i communicates with the cylindernJ, inw ch is'arranged a plun or K.- Arran ed in the .end of the lunger is avalve '70., his valve is arrange to seatover the passa e i and close it.Leading into the'cylinder is a connection for the receiver J. "-A' pipe1 leads om the plunger is e pin 1c T '51 operates mally 0 en, sotthatthe fluid under pressure cylinder A and held open by the pressureinvention the receiver or receiver connec Each of the valve-chambers (1 1scon- :1 open to theatmosphere. The pressure'in to end of the cylinderthrough the passage A passage 9 extends from the chamber G to the closethis passage. The upper end of this 'valve H asses through the gland 'i.A'stem from this connection to the'receiver connecfro r0 which themovement limited. Extending from the lever L also is an arni X, on whichis placed the weight N.

The weight may be shifted on the arm N and secured in any position bymeans of the screw n. Extending from the yoke k is an arm h.

In th e end of this arm isa hollow screw g arranged to be locked in anyadjusted position by means of the am-nut g. The stem 9 of th'e valve Gextends .into the screw (7. A

PPi Dg g is arranged to move the valve G to arm h, thus permitting 3 5eration heretoforedescribed.

its seat.

The operation of the several mechanisms is as follows: When thereceiver-pressure rises above the desired maximum, it forces 25 theplunger K outwardly,

thus opening the valve is. Air or fluid under pressure passes throughthe passage i and operating on the under side of the plunger H raisesit, opening the valve H and at the same time raises the the spring 9 toclose the valve 'G. The air from the chamber G, and consequently fromthe chamber a, immediately escapes to the atmosphere, and the pressureforces the valves l) open, with the op- The pressure at which the reliefdevice will act can be regulated by changing the tension of the spring Mor the position of the weight N. As soon as the receiver-pressurebecomes reduced to 0 the desired minimum the spring M and weight X,operating on the plunger K, close the valve k. The air in the chamber 1and cylinder I exhausts through the minute opening The springs ll thenforce the valve 5 Tito itsseat and at the same time, opcratin throughthe arm [0, open the valve G, an

i the pumping action proceeds.

v In this scheme of relief device the air in the compressor is of coursereduced below that of 5c the receiver-pressure, and it becomesnecessary,-therefore, to provide some valve device this position hammerswith each l of thecom pressor.=

for preventing a bahkflow of fluid from the receiver. The check-valve Fis provided for thispurpose. An ordinary check-valve in ulsation As itis desirable to prevent this action, T provide the following mechanismfor this purpose: The checkvalve is fixed on a stem which passes throughthe gland f on the side of the valvechamber Ei Arranged on the stem f isan arm Q, A cylinder 0 extends from one of the passages'll. A plunger Iis arranged in this cylinder and 'is connected with the arm 0 5 Q by theconnecting-rod 1). The pin 1), by

which the connection is made between the plunger and connecting-rod, isextended to each side of the plunger. Lugs o extend from the cylinder 0,and the springs R R are tensioned between the pin 1; and the lug 0.These springs operating through the connecting-rod and arm Q close thevalve F soon as the plunger is relieved of air-pressure. As the cylinder0 is connected with one of the pipes (1, this takes place whenever therelief operation takes place, so that immediately the relief device isbrought into operation the valve F is instantly closed through theaction of the springs It R, thus preventing any escape of fluid from thereceiver. As soon as the relief device is thrown out of operation, asheretofore described, and' pressure is exerted on the fluid in the piped ressure is cxerted on the plunger P, and tiis is of suflicient area toovercome the springs R R, and thus open the valve I. By this mechanismthe hammering of the valve F is prevented. It forms an instant checkagainst the back movement of fluid from the receiver and is instantlyopened when the pressure in the passages between the valve l and thecompressor reaches a pressure approximating receiver-pressure It will benoted that the plunger K forms a primary motor and that this controlsthe valve controlling the secondary motor and that the counter-pressureon the primary motor may be adjusted by the tension of the springs M andthe weight X, that'the plunger ll forms a secondary motor controllingthe relief device or valve, that the plunger P forms a motor by whichthe check-valve F is controlled. When the term receiver is used in theclaims, it is intended to include any passage or receptacle into whichfluid is pumped. I

In the alternative construction shown in Figs. 6 and 7 the mechanismdiffers from that of the preferred construction in that the air isexhausted to the atmosphere with each opcration of theeompressor insteadof being pumped from end to end and the valves D I) operate with eachreci rocation of the piston. In this construction t e parts differingfrom those of the referred construction are the cylinder 1 w ich isconnected with the pas sage I and has in it a piston Il,which operates avalve-stem II. This stem extends through the fitting t, the fittingmaking a tight joint between it and the passage G, leadin to thereceiver. An openin G" leads from 1; 1e passage G to the atmosphere, andthis is controlled by the valve at the end of the stem II. A stem h"extends from the piston above the cylinder. A yoke h is attached to thisstem. A lock-nut h is pro? vided for locking it in adjustment. Thesprings H are secured to the yoke. In the operation of this mechanismwhen the pressure exceeds the desired maximum the piscombination withthe compressor-valve; a

, ;means for connecting said rimary motor- 1 the valve G in saidconnection; means for chamber for said valve; a primary motor; a valvecontrolled by said primary motor;

with the passage into which uid is umped a secondary motor controlled bythe valve actuated by the primary motor; a fluid-passage into which thefluid is pumped by the compressor; a connection between said assage andsaid compressor-valve cham er;

connecting the valve G with the secondary motor; and the valve Hcontrolling an outlet to the atmosphere from the connection between saidpassage and the valve-chamber,

whereby the connectionis closed to the fluidpassage when said connectionis open to the atmos here. I 1 2. n a relief dev ce for compressors thecombmation with the compressor-valve D;

the chamber ain which said valve operates the passageE'into which fluidis pumped by the compressor; a connection between said passage and thechamber a; a primary motor connected with the passage into which fluidis pum ed; a valve controlled by said -motor, sai valve controlling apassage leading to achamber I, said chamber having a contractedoutlet-passage t; a secondary motor in communicatlon with the chamber 1and valves operated by said secondary motor toclose the connectionbetween the'passage E and the chamber a and to open the connectlontobring the chamber. a into communication with the atmosphere.

3 In a relief device for compressors the comblnation with thecompressor-valve D;

the chamber a which said valve operates;

the passage E into which fluid is pumped by the compressor; a connectionbetween said passage and the chamber a; a primary motor connected withthe passa e into which fluid is pumped; a valve contro led by saidmotor, sald valve controlling a passage leading to a' chamber I, saidchamber having a contract- 1 ed outlet-passage t the secondary motorcomprising the cylinder I and piston 11, the

gland t on said cylinder; the valve H extending through said gland andconnected with the piston H the stern h extending from the piston H; thevalve G arranged to control the connection between the passage E andchamber a; and means connecting the valve with the stem h.

4. Inv a relief device for compressors a re.- ceiver connection incommunication with the compressor a valve arranged to prevent backflowfrom said receiver connection toward the compressor; a valve-motor foropening said valve; a valve for controlling said valve- -motor; aseparate motor for actuating the relief device; and means acting withthe relief device'foractuating the valve controlling the valve-motor.

In a relief device for compressors, the

combination of the receiver connection E; the check-valve'F forpreventing a b'ackflow of pressure therefrom; the stem f for saidcheck-valve; the arm Q on said stem said .stem and arm being arranged toactuate the valve F; the cylinder 0; a plunger in said cylinder; springstensioned against said plunger; a connection between said plunger andthe arm on the stem; a passage controlled by the relief device 'for'admitting fluid under pressure to said cylinder when the relief deviceis out of operation; means for reducing the pressure in said passagewhen the-relief devlce is in operation and a separate motorforcontrolhng the relief device.

' In testimony whereof I allix my signature in presence of twowitnesses.

v RUDOLPH CONRADER.

Witnesses? 1 GRACE E. YARD, H. 0. Loan.

